EP2207748A1 - Composant electronique a connexions par billes decouplees mecaniquement - Google Patents
Composant electronique a connexions par billes decouplees mecaniquementInfo
- Publication number
- EP2207748A1 EP2207748A1 EP08846382A EP08846382A EP2207748A1 EP 2207748 A1 EP2207748 A1 EP 2207748A1 EP 08846382 A EP08846382 A EP 08846382A EP 08846382 A EP08846382 A EP 08846382A EP 2207748 A1 EP2207748 A1 EP 2207748A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chip
- layer
- support
- connection location
- component according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems ; Auxiliary parts of microstructural devices or systems
- B81B7/0032—Packages or encapsulation
- B81B7/0045—Packages or encapsulation for reducing stress inside of the package structure
- B81B7/0048—Packages or encapsulation for reducing stress inside of the package structure between the MEMS die and the substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2207/00—Microstructural systems or auxiliary parts thereof
- B81B2207/07—Interconnects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C2203/00—Forming microstructural systems
- B81C2203/03—Bonding two components
- B81C2203/033—Thermal bonding
- B81C2203/035—Soldering
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistors
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistors electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistors electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3431—Leadless components
- H05K3/3436—Leadless components having an array of bottom contacts, e.g. pad grid array or ball grid array components
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/01—Manufacture or treatment
- H10W72/012—Manufacture or treatment of bump connectors, dummy bumps or thermal bumps
- H10W72/01251—Changing the shapes of bumps
- H10W72/01257—Changing the shapes of bumps by reflowing
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/071—Connecting or disconnecting
- H10W72/072—Connecting or disconnecting of bump connectors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/20—Bump connectors, e.g. solder bumps or copper pillars; Dummy bumps; Thermal bumps
- H10W72/241—Dispositions, e.g. layouts
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/20—Bump connectors, e.g. solder bumps or copper pillars; Dummy bumps; Thermal bumps
- H10W72/251—Materials
- H10W72/252—Materials comprising solid metals or solid metalloids, e.g. PbSn, Ag or Cu
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/20—Bump connectors, e.g. solder bumps or copper pillars; Dummy bumps; Thermal bumps
- H10W72/281—Auxiliary members
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/20—Bump connectors, e.g. solder bumps or copper pillars; Dummy bumps; Thermal bumps
- H10W72/29—Bond pads specially adapted therefor
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/90—Bond pads, in general
- H10W72/931—Shapes of bond pads
- H10W72/932—Plan-view shape, i.e. in top view
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/90—Bond pads, in general
- H10W72/951—Materials of bond pads
- H10W72/952—Materials of bond pads comprising metals or metalloids, e.g. PbSn, Ag or Cu
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W74/00—Encapsulations, e.g. protective coatings
- H10W74/10—Encapsulations, e.g. protective coatings characterised by their shape or disposition
- H10W74/111—Encapsulations, e.g. protective coatings characterised by their shape or disposition the semiconductor body being completely enclosed
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W90/00—Package configurations
- H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
- H10W90/721—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bump connectors
- H10W90/724—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bump connectors between a chip and a stacked insulating package substrate, interposer or RDL
Definitions
- the invention relates to the field of electronic components comprising chips intended to be connected, or coupled, by "flip-chip” (that is to say, via beads, or microbeads), connection, on a support such as an electronic printed circuit.
- chip here and throughout the rest of the document, is meant any electronic element using electrical connections, for example a MEMS (electromechanical microsystem), an NEMS (electromechanical nanosystem), an MOEMS (optoelectromechanical microsystem), an imager or another MOS circuit.
- flip-chip The technique of transfer by beads, or microbeads, called “flip-chip", consists in transferring a chip to a support by means of several balls, or microbeads, disposed on a front face of the chip and / or the support, for example on the periphery of this face. These balls are based on a fusible material such as a gold alloy and tin.
- the balls are heated to a temperature greater than or equal to the melting point of the material constituting them.
- the chip is then placed over the support, the beads then forming solid connections, after cooling of the fusible material, between the chip and the support.
- the material of the support for example a plastic material, a resin, or a PCB (polychlorobiphenyl)
- the chip material for example silicon, glass, etc.
- mechanical stresses appear at these balls and / or inside the chip, during the cooling of the fusible material constituting them. These mechanical stresses may in particular cause delamination at the level of the connection between the balls and the chip and / or between the balls and the support, thereby weakening the connections made between the chip and the support.
- An object of the present invention is to provide an electronic component comprising at least one chip and / or a support, as well as a method for producing such a component, reducing the mechanical stresses, and in particular those leading to delamination problems. , appearing at the connection balls during a transfer of the chip on the support.
- the present invention proposes a component, for example an electronic component, comprising at least one chip and / or a support, the chip being intended to be carried on the support and connected, at at least one connection location of the chip formed by at least a portion of a layer of the chip, to at least one connection location of the support formed by at least a portion of a layer of the support by at least one ball, the chip and / or the support comprising means for mechanically decoupling the connection location of the chip and / or the support with respect to the chip and / or the support, formed by at least one cavity , for example buried, made in the layer of the chip and / or the support, under the connection location of the chip and / or the support, and at least one trench, made in the layer of the chip and / or the support, communicating with said cavity.
- Said trench may partially surround said portion of the layer such that at least one zone of said layer connects said portion of the layer to the rest of this layer and being based on at least one non-metallic material.
- connection locations or contact pads, that is to say at the locations intended to receive the connection balls, the chip and / or the support.
- This mechanical decoupling thus makes it possible to "absorb", or to compensate, all or part of the mechanical stresses arising in particular during the cooling of the fusible material of the connection balls by means of mechanical decoupling means formed by one or more trenches and cavities made at the the location (s) of connection, reducing in particular the risk of delamination at the interfaces between the balls and the support and / or between the balls and the chip.
- a flexible zone is thus formed connecting the portion of the layer, intended to receive the connecting ball, to the remainder of this layer, at one or more of the connection locations of the chip and / or the support.
- These flexible zones form zones of absorption of mechanical stresses called "spring beams".
- This mechanical decoupling can be carried out at all connection locations of the chip and / or the support intended to receive a connecting ball, or at only a part of these locations.
- the mechanical decoupling can be achieved at the critical locations, that is to say those which are likely to undergo the main mechanical stresses during assembly of the chip with the support, such as those found in periphery of the chip, near the outer edges of the chip.
- the invention is particularly applicable for chips whose dimensions are for example greater than about 5 mm side and / or using connecting balls of small dimensions, for example less than about 100 microns.
- This mechanical decoupling also makes it possible to perform a mechanical filtering of the vibrations of the electronic component. Indeed, it is possible to calibrate the rigidity of the connection between the support and the chip through the number, shape and dimensions of the trench or cavities of decoupling performed at the connection locations, thereby adjusting the bandwidth for the component. For example, when it is desired to measure a resonance frequency of the component within a precise frequency range, the mechanical decoupling can be used to filter the frequencies experienced or generated by the component outside this range.
- the trench may be disposed at the periphery of the connection location of the chip and / or the connection location of the medium.
- the trench may communicate the cavity with one side of the layer of the chip and / or the support.
- the portion of the layer of the chip and / or the portion of the layer of the support may have a substantially polygonal shape, for example rectangular, or a disc shape in a plane parallel to a main plane of the chip layer and / or the support layer.
- the trench may comprise, in a plane parallel to a main plane of the layer of the chip and / or the layer of the support, for example a shape chosen from a rectangular pattern or a circular arc pattern.
- the mechanical decoupling means may comprise, for example, at least four trenches made in the layer of the chip and / or the layer of the support, making the cavity communicate with a face of the layer of the chip and / or the layer of the support.
- the trench may comprise at least one comb pattern.
- the decoupling means may include viscous damping comb type units, that is to say having one or more trenches forming at least one damping comb, in which a fluid, for example an oil, is arranged. whose viscosity is such that the component is not resonant.
- the trench may comprise, in a plane parallel to a main plane of the layer of the chip and / or the support, a pattern formed by one or two arcs of circles connected to one another at one end.
- the shape, the dimensions and the number of trenches used depend on the applications envisaged and in particular on the directions of the stresses undergone by each of the connection locations of the chip and / or the support during the transfer of the chip onto the support. It is thus possible to make trenches capable of compensating all or part of these constraints in one or more privileged directions, with possibly a specific pattern at each connection location according to the force and the direction of the stresses undergone at each connection location. .
- the mechanical decoupling means may further comprise at least one plastic and / or viscous material disposed in all or part of the cavity and / or the trench.
- This plastic and / or viscous material can have several functions. In particular, it can protect the interior of the cavity and / or the trench in particular during soldering of the fusible material of the connecting ball. It can also make it possible to ensure a mechanical frequency filtering by the absorption of certain frequency ranges, in particular the high frequencies due for example to parasitic vibrations. In all cases, this plastic and / or viscous material does not eliminate the mechanical decoupling function provided by the cavity and the trench.
- a plastic material may be a resin, a viscous material that may be, for example, oil.
- Plastic material and / or viscous material is part of the mechanical decoupling means of the invention.
- Plastic material and / or viscous material is understood to mean a material having a deformation capacity, in particular so as not to oppose the mechanical decoupling of the connection locations.
- connection location of the chip and / or the connection location of the support may comprise at least a portion of an electrically conductive material, for example metal-based, disposed on the portion of the layer of the chip and / or the support, directly or via a suitable interface material, for example on the side of said face of the layer.
- an electrically conductive material for example metal-based
- the portion of conductive material may form an electrical contact between at least two elements of the component. These elements may for example be microelectronic devices, such as transistors or other active or passive components, and / or MEMS, and / or NEMS, and / or MOEMS.
- the component may further comprise at least one metal track made on the chip and / or the support, and electrically connected to the portion of conductive material.
- the portion of conductive material may form at least a portion of an electrical contact between the chip and the support.
- the chip may comprise at least one device of the MOS type and / or at least one MEMS, and / or at least one NEMS, and / or at least one MOEMS, for example made in the layer of the chip.
- the chip can be electrically connected to the support via the ball.
- the mechanical decoupling means can perform a mechanical filtering between the chip and the support.
- the chip may be made from a material whose thermal expansion coefficient is different from that of a material from which the support is made.
- the electronic device may further comprise a material including the component, that is to say the chip and / or the support, for example a polymer or a resin.
- This material protects the component without removing the mechanical decoupling function provided by the mechanical decoupling means.
- the coating material may or may not be similar to the plastic and / or viscous material that may be disposed in the trench and / or the cavity.
- the non-metallic material of said zone of the layer, or "beam-spring" zone can comprise silicon and / or silicon oxide and / or silicon nitride.
- the non-metallic material of said "spring-beam” zone may also comprise doped silicon whose resistivity is less than about 1 Ohm. cm.
- the present invention also relates to a method for producing an electronic component comprising at least one chip and / or a support, the chip being intended to be carried on the support and connected to at least one connection location of the chip, at least one connection location of the support by at least one ball, comprising at least the steps of: - producing at least one trench in at least a first layer, communicating with at least a portion of a sacrificial layer arranged against the first layer.
- the trench and the cavity forming mechanical decoupling means of the connection location of the chip and / or the connection location of the support relative to the chip and / or the support.
- the invention also relates to a method of producing a component comprising at least one chip and / or a support, the chip being intended to be carried on the support and connected to the level of at least a chip connection location, at least one media connection location with at least one ball, comprising at least the steps of:
- the trench , the cavity and said zone of the layer forming mechanical decoupling means of the connection location of the chip and / or the connection location of the support with respect to the chip and / or the support, said zone of the layer being based on at least one non-metallic material.
- the method may further comprise a step of producing a portion of a conductive material disposed on the portion of the first layer, for example on the side of a face of the first layer communicating with the cavity via the trench.
- the method may further comprise, between the step of removing the portion of the sacrificial layer and a step of transferring the chip to the support, a step of filling the cavity and / or the trench with a plastic and / or viscous material.
- the method may further comprise, after a step of transferring the chip to the support, a step of depositing a coating resin on the electronic component.
- the present invention may also relate to a method of mechanical filtering between at least one support and a chip, as described above, coupled to the support.
- FIG. 1 represents a view from above of a chip with mechanically decoupled connection locations, object of the present invention, according to a first embodiment
- FIGS. 2 and 3A respectively represent a sectional view and a top view of a first example of a mechanically decoupled connection location of a chip
- FIG. 3B represents a view from above of a variant of the first example. connection location decoupled mechanically from a chip
- FIG. 4A represents a view from above of a second example of a mechanically decoupled connection location of a chip
- FIG. 4B represents a partial top view of a variant of the second example of a mechanically decoupled connection location of a chip
- FIGS. 5 to 7 represent the steps of a method for producing a slot chip
- - Figures 8 and 9A show sectional views of a chip with connection locations mechanically decoupled, object of the present invention, according to a third embodiment realization
- FIG. 9B represents a top view in section of a chip with mechanically decoupled connection locations, object of the present invention, according to the third embodiment.
- FIGS. 2 and 3A respectively represent a sectional view and a top view of a first example of one of these connection locations 102.
- the chip 100 comprises a layer 104, for example based on at least one semiconductor such as silicon.
- This layer 104 may in particular be an active layer of the chip 100.
- One or more microelectronic devices such as MOS devices or MEMS, not shown, may in particular be made on this active layer 104.
- the connection locations 102 are here made on a face 106 of the active layer 104. In the example of the chip 100 shown in Figure 1, the connection locations 102 are formed at the periphery of the active layer 104, that is to say close to the outer edges of the the layer 104, in a pattern forming two concentric rectangles.
- Each connection location 102 is formed by a portion 108 of the active layer 104.
- a cavity 110 here buried in the layer 102, is formed under each of the portions 108 of the active layer 104.
- Each portion 108 may be delimited, in a plane parallel to the (x, y) plane, main plane of the active layer 104, of the remainder of the active layer 104 by the pattern of the cavity 110.
- the cavity 110 has a rectangular shape.
- Each connection location 102 also includes a portion 112 of a conductive material, for example a metal such as gold, for receiving a connecting ball.
- Each connection location 102 may also comprise a sub-metallization (UMB) layer, not shown in the figures described here, on the portion 112.
- UMB sub-metallization
- the conductive portion 112 is centered relative to the center of the cavity 110.
- trenches 114 here four in number and rectangular in shape, are formed in the portion 108, making the cavity 110 communicate with the outer face 106 of the active layer 104
- the trenches 114 are formed at the periphery of the portion 108, surrounding the portion 108, and are parallel in pairs.
- Each trench 114 forms, in a plane parallel to the plane (x, y), a rectangle whose largest side is parallel to one of the sides of the rectangle formed by the cavity 110 in a plane parallel to the (x, y) plane.
- the cavity 110 and the trenches 114 thus form here mechanical decoupling means of the connection location 102 with respect to the chip 100.
- Zones 109 are able to achieve a mechanical absorption of the stresses that may appear at the portion 108 through the mechanical decoupling between the portion 108 and the rest of the active layer 104 .
- beam-spring zones 109 are formed in the active layer 104 whose predominant material, that is to say forming a large part of the layer 104, can be a suitable material. to absorb strong mechanical stresses without breaking. It is thus possible to dimension beam-spring zones
- Such a material, which is non-metallic may be silicon, for example monocrystalline, silicon oxide, or silicon nitride, or else doped silicon.
- FIG. 3B represents a variant of the first example of a connection location 102.
- only one trench 114 is formed on the periphery of the portion 108.
- the portion 108 is thus connected to the the remainder of the layer 104 at a single zone 109 capable of absorbing the stresses along the direction of the vector y shown in FIG. 3B.
- FIG. 4A represents a view from above of a second example of connection location 102 mechanically decoupled from chip 100. Compared with the first example of FIGS. 2, 3A and 3B, this second example comprises a cavity 110 of cylindrical shape.
- the portion 108 of the active layer 104 is also cylindrical.
- each trench 114 here is a pattern, in a plane (x, y), formed by two arc of circles connected to one another at one end by a parallelogram. These two circular arcs are arranged on two circles of different diameters having, in this example, the center of that of the cavity 110. Zones 109 beams-springs, that is to say zones of absorption of mechanical stresses, are located between two arcs of circles of two trenches 114 neighbors.
- a portion of conductive material can also be placed on the portion 108 of the active layer 104.
- FIG. 4B shows a partial top view of a variant of the second connection location example 102 previously described in connection with FIG. 4A.
- each trench 114 has a pattern, in a plane (x, y), formed by two arcs of circles connected to one another at one end by at least one interdigitated comb, by example two interdigitated combs 115 as shown in Figure 4B.
- the number of trenches made in the active layer, the shape of these trenches and the general pattern formed by the trenches may be different from the examples described above. It is also possible that the mechanical decoupling of a connection location is formed in part by several cavities made in the layer 104.
- connection balls are deposited, or formed by deposition and recasting, on the connection locations 102, in particular on the conductive portions 112.
- connection beads are made from a fusible material such as an alloy of gold and tin, or tin and lead, or indium and tin . They are heated to a temperature greater than or equal to the melting point of the fusible material, then, on cooling, the fusible material becomes solid, thus welding the balls to the conductive portions 112.
- the chip 100 can then be connected to the printed circuit by placing it against the printed circuit by means of the connecting balls, then by brazing the balls between the chip 100 and the printed circuit.
- connection beads are distributed both on the chip and on the support before making the connection of the chip on the support.
- the cavities 110, the trenches 114 and the beam-spring zones 109 perform a mechanical decoupling at each connection location 102.
- connection locations 102 are made according to the example described with reference to FIGS. 2, 3A and 3B or that of one of FIGS. 4A or 4B, FIG.
- connection locations 102 each of them comprises one or more cavities, one or more trenches and beam-spring zones connecting the portion forming the connection location to the remainder of the active layer, forming mechanical decoupling means.
- connection locations 102 it is possible that only part of the connection locations 102 have these mechanical decoupling elements, the others connection locations 102 having no trenches or cavity formed under the active layer portion forming the connection location.
- critical connection locations may include these mechanical decoupling elements.
- connection locations forming the rectangle closest to the outer edges of the layer 104 may for example comprise the mechanical decoupling elements.
- connection locations of the chip are decoupled mechanically.
- all the connection locations of the support, or part of these connection locations, for receiving the connection balls can be decoupled mechanically from the support.
- This mechanical decoupling of the support connection locations is carried out in a manner similar to the examples described above (making one or more cavities and trenches in the support layer).
- the mechanical decoupling of the connection locations can be carried out at the level of the support and / or the chip.
- the conductive portions 112 may also make electrical contact pads allowing, for example, the circulation of electrical signals between the chip 100 and the support on which the chip 100 is connected via the connecting balls and / or between different elements.
- the chip 100 and / or the carrier via tracks metal made on the chip 100 and / or on the support, and connected to the conductive portions 112. These tracks may in particular connect different elements of the chip 100 between them, for example microelectronic devices and / or MEMS. Metal interconnection tracks may also be made on the side of the support that does not include the chip 100 and / or be buried in the layer 104 of the chip 100 or in the support. In addition to their mechanical decoupling function, the trenches 114, the cavities 110 made in the active layer 104 and the beam-spring zones 109 can also perform mechanical filtering.
- This filtering is, for example, useful if it is desired to measure a resonance frequency of the chip or of a component made on the chip, which may be a MEMS, within a certain frequency range.
- a resonance frequency of the chip or of a component made on the chip which may be a MEMS
- a viscous type of damping it is possible to play on the plasticity or the viscosity of the material, for example oil, disposed in the trenches.
- the material for example oil
- a fluid for example an oil, is preferably used.
- a resin including the assembly formed by the chip 100 carried and the support This resin may in particular fill the trenches and / or the cavities formed at the connection locations 102.
- the resin is chosen such that it can act as an absorber (or damper) of the vibrations undergone by the chip and / or the support.
- This material may be a coating resin.
- a fluid is disposed in the trench or trenches and / or in the cavity or cavities forming mechanical decoupling means, it is preferably carried out a coating of the chip and support assembly to contain this fluid in its location.
- the chip 200 is made for example of CMOS technology from a silicon substrate 201, on which is disposed a metal interconnection layer 204 based on silicon oxide and metal.
- CMOS devices not shown, and the metal interconnection layers are made according to a standard CMOS process.
- part of a layer lower metal 203 and a portion of an upper metal layer 212 are particularly shown.
- a passivation layer 205 for example based on silicon nitride, may be deposited on a face 206 of the layer 204 and on the upper metal layer 212 also on the face 206 of the layer 204.
- passivation 205 may comprise an opening at the level of the metal 212.
- an additional UBM layer may also be deposited on the passivation layer 205 and / or on the metal layer 212.
- connection locations 202 of the chip 200 are made on the face 206 of the layer 204.
- the connection locations 202 are preferably made around the periphery of the layer 204, that is to say near the outer edges of the layer 204.
- lithography and trench etching 214 are carried out in the active layer 204 and the passivation layer 205. These trenches 214 form an access to an isolated pattern of the lower metal layer 203 which is used here as a sacrificial layer. The portion of the lower metal layer 203 is then etched to form a cavity 210 under a portion 208 of the layer 204. Zones 209, connecting the portion 208 to the remainder of the layer 204, are obtained in the layers 204 and 205, forming beam-spring zones similar to zones 109 previously described.
- This sacrificial etching may be performed by wet etching, for example of the HCl (hydrogen chloride) type.
- the cavity 210 delimits, in a plane parallel to the (x, y) plane, the portion 208 forming a connection location with respect to the remainder of the active layer 204 and the passivation layer 205.
- the zones 209 can be formed only in the layer 204. In this case, the passivation layer 205 is previously opened, for example by etching, at the location of the zones 209.
- the postponement of the chip 200 for example on a printed circuit, can then be similar to that described for the chip 100.
- the cavity 210 and the trenches 214 then perform a mechanical decoupling within the connection location 202.
- the conductive portions 212 may form an electrical contact line between the connection location and the remainder of the chip 200 to carry electrical signals.
- these electrical contact lines are covered by the passivation layer 205.
- This filtering function can also be performed when no material or fluid is deposited in the cavity or the trench, the air present in the trench and the cavity already performing a damping of vibration undergone by the chip and / or the support.
- a mechanical decoupling When a mechanical decoupling is carried out on the support, it can be formed by several layers, of which for example a lower metal-based layer is used as a sacrificial layer for producing a cavity, in a similar way to the realization of the mechanical decoupling cavity previously made in the chip.
- Figures 8, 9A and 9B show another example of a chip 300 having mechanically decoupled connection locations 302 according to a third embodiment.
- This chip 300 comprises in particular a MEMS 301 produced on an SOI substrate formed by a layer 304 for example based on silicon, a dielectric layer 306, for example silicon oxide, and an active layer 308 based on silicon.
- This MEMS 301 is for example an accelerometer, a gyrometer or a pressure sensor.
- the silicon of the active layer 308 may be sufficiently conductive to pass an electrical signal between the MEMS 301 and a connection location 302.
- this silicon may be doped with boron or phosphorus to obtain a resistivity of less than a few ohms . cm (for example less than 9 ohm.cm or 5 ohm.cm).
- the level of doping can be chosen as large as possible while remaining below the limit of degeneration of the material to maintain good mechanical quality of the crystalline structure of silicon, a resistivity for example between about 1 milliOhm.cm and 900 milliOhm.cm.
- Insulation trenches 320 providing electrical and / or mechanical insulation depending on the type of MEMS, partly separate the MEMS 301 from the remainder of the active layer 308.
- FIG. 9B represents a top view in section in the plane of the dielectric layer 306 of this chip 300.
- the active layer 308 has for example a thickness of between about 1 micron and 1 mm.
- Trenches 314, for example similar to the trenches 114 and 214 described above, for mechanical decoupling are carried out in the MEMS 301.
- a cavity 310, made under the MEMS 301, also forms a mechanical decoupling cavity of the connection location 302.
- zones 309 of mechanical decoupling, forming beam-spring zones substantially similar to the zones 109 and 209, contribute to the mechanical decoupling of the connection location 302.
- the trenches 314 can be made by DRIE etching (FIG. deep reactive ion etching).
- a portion of a conductive material 312 is made on the MEMS 301 and is intended to perform the silicon contact recovery and also to receive a first connection ball 316.
- the mechanically decoupled location is here formed by a portion of the MEMS 301.
- the chip 300 is connected to a support 400 formed by a layer 404 via the connection balls 316 previously made on the chip 300 and / or on the support 400.
- connection locations 402 receiving the connection balls 316 are not decoupled mechanically unlike the connection location 302 formed in the chip 300.
- connection locations 402 can be decoupled mechanically by at least one trench and at least one cavity formed in the layer 404 of the support 400, for example similarly to the realization of the trenches and cavities formed in the chip described above .
- a second ball 316 is shown, connecting the active layer 308 to the support 400.
- connection location 303 made on the MEMS 301 which is not decoupled mechanically.
- the connection locations can be made on "passive" parts of the layer, that is to say on parts that do not include an active device, and / or on active parts such as MEMS. 301.
- the assembly of the chip 300 on the printed circuit 400 may be similar to that described for the chip 100.
- the cavity 310 and the trenches 314 then perform a mechanical decoupling within the connection location 302 of the chip 300 shown in Figures 8, 9A and 9B.
- the conductive portions 312 may also form, in addition to their mechanical connection function, contact pads for routing electrical signals. It is also possible that trenches 314 and the cavity 310 are filled with a material or a fluid providing a damping function of the stresses experienced at the connection location 302.
- a resin may also encompass the entire component formed by the chip 300 and the support 400.
- the chip 300 can also be protected by a hermetic cover, for example a pyrex cover with anodic sealing, especially when it is desired that the chip is arranged in a vacuum environment.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Micromachines (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Wire Bonding (AREA)
- Thermistors And Varistors (AREA)
- Ceramic Capacitors (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0758879A FR2923650B1 (fr) | 2007-11-08 | 2007-11-08 | Composant electronique a connexions par billes decouplees mecaniquement. |
| PCT/EP2008/065055 WO2009060029A1 (fr) | 2007-11-08 | 2008-11-06 | Composant electronique a connexions par billes decouplees mecaniquement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2207748A1 true EP2207748A1 (fr) | 2010-07-21 |
| EP2207748B1 EP2207748B1 (fr) | 2012-08-22 |
Family
ID=39587850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08846382A Not-in-force EP2207748B1 (fr) | 2007-11-08 | 2008-11-06 | Composant electronique a connexions par billes decouplees mecaniquement |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8324695B2 (fr) |
| EP (1) | EP2207748B1 (fr) |
| JP (1) | JP5535927B2 (fr) |
| FR (1) | FR2923650B1 (fr) |
| WO (1) | WO2009060029A1 (fr) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8198133B2 (en) * | 2009-07-13 | 2012-06-12 | International Business Machines Corporation | Structures and methods to improve lead-free C4 interconnect reliability |
| JP5673181B2 (ja) * | 2011-02-15 | 2015-02-18 | トヨタ自動車株式会社 | 半導体装置 |
| US9184138B2 (en) * | 2011-12-29 | 2015-11-10 | Stmicroelectronics (Grenoble 2) Sas | Semiconductor integrated device with mechanically decoupled active area and related manufacturing process |
| DE102013101315A1 (de) * | 2013-02-11 | 2014-08-14 | Endress + Hauser Gmbh + Co. Kg | Verfahren zur Verlötung eines Anschlusselement |
| DE102013204234A1 (de) * | 2013-03-12 | 2014-09-18 | Robert Bosch Gmbh | Sensor und Verfahren zum Herstellen einer Lötverbindung zwischen einem Sensor und einer Leiterplatte |
| TWI514938B (zh) | 2013-12-26 | 2015-12-21 | Ind Tech Res Inst | 撓性電子模組 |
| JP6531603B2 (ja) | 2015-10-01 | 2019-06-19 | 富士通株式会社 | 電子部品、電子装置及び電子装置の製造方法 |
| FR3075772B1 (fr) | 2017-12-22 | 2020-11-20 | Commissariat Energie Atomique | Mise en œuvre d'une structure de decouplage pour l'assemblage d'un composant avec un boitier |
| FR3087264B1 (fr) * | 2018-10-11 | 2020-11-06 | Safran Electronics & Defense | Assemblage electronique et dispositif de mesure de pression a durabilite amelioree |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759047A (en) | 1996-05-24 | 1998-06-02 | International Business Machines Corporation | Flexible circuitized interposer with apertured member and method for making same |
| JPH10303345A (ja) * | 1997-04-28 | 1998-11-13 | Shinko Electric Ind Co Ltd | 半導体チップの基板への実装構造 |
| JP2003198068A (ja) * | 2001-12-27 | 2003-07-11 | Nec Corp | プリント基板、半導体装置、およびプリント基板と部品との電気的接続構造 |
| US7265045B2 (en) * | 2002-10-24 | 2007-09-04 | Megica Corporation | Method for fabricating thermal compliant semiconductor chip wiring structure for chip scale packaging |
| DE10360127A1 (de) * | 2003-12-20 | 2005-07-21 | Daimlerchrysler Ag | Leiterplatte mit flexiblem Anschlusspad |
| DE102004031888A1 (de) * | 2004-06-30 | 2005-10-20 | Infineon Technologies Ag | Halbleiterbauteil mit Außenkontakten in Form von Lotkugeln und Verfahren zur Herstellung desselben |
| US7344907B2 (en) * | 2004-11-19 | 2008-03-18 | International Business Machines Corporation | Apparatus and methods for encapsulating microelectromechanical (MEM) devices on a wafer scale |
| US8067840B2 (en) * | 2006-06-20 | 2011-11-29 | Nxp B.V. | Power amplifier assembly |
| DE102007028288B4 (de) * | 2007-06-20 | 2013-06-06 | Epcos Ag | Mit akustischen Wellen arbeitendes MEMS Bauelement und Verfahren zur Herstellung |
| FR2925888A1 (fr) | 2007-12-27 | 2009-07-03 | Commissariat Energie Atomique | Dispositif a structure pre-liberee |
| FR2925889B1 (fr) | 2007-12-27 | 2010-01-29 | Commissariat Energie Atomique | Procede de realisation d'un dispositif micromecanique et/ou nanomecanique a butees anti-collage |
| FR2933389B1 (fr) | 2008-07-01 | 2010-10-29 | Commissariat Energie Atomique | Structure a base d'un materiau getter suspendu |
-
2007
- 2007-11-08 FR FR0758879A patent/FR2923650B1/fr not_active Expired - Fee Related
-
2008
- 2008-11-06 EP EP08846382A patent/EP2207748B1/fr not_active Not-in-force
- 2008-11-06 JP JP2010532588A patent/JP5535927B2/ja not_active Expired - Fee Related
- 2008-11-06 WO PCT/EP2008/065055 patent/WO2009060029A1/fr not_active Ceased
- 2008-11-06 US US12/740,809 patent/US8324695B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009060029A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011503862A (ja) | 2011-01-27 |
| US8324695B2 (en) | 2012-12-04 |
| EP2207748B1 (fr) | 2012-08-22 |
| US20100244246A1 (en) | 2010-09-30 |
| FR2923650A1 (fr) | 2009-05-15 |
| JP5535927B2 (ja) | 2014-07-02 |
| FR2923650B1 (fr) | 2010-09-03 |
| WO2009060029A1 (fr) | 2009-05-14 |
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